code: def test_feature_not_same():
      np.random.seed(26)
  
      multiple = np.array([rand_haralick() for i in range(8)])
      assert np.all(multiple.ptp(0) > 0)
  
imports: import numpy
  from mahotas.features import texture
  import mahotas
  import mahotas.features._texture
  import pytest
label_desc: Use image node_id 19 for calling a global function with example usage: test_feature_not_same() without return types